Refuse incinerator insert for containers



July 5, 1966 E. A. HANCE 3,259,084

REFUSE INGINERATOR INSERT FOR CONTAINERS Filed July 29, 1963 5 Sheets-Sheet l EDWAPDA f/4A/C'E I NVE NTOR.

ATTOPA/FY July 5, 1966 A, Nc 3,259,084

REFUSE INCINERATOR INSERT FOR CONTAINERS Filed July 29, 1963 5 Sheets-Sheet 2 O 44 Z9 Z8 45 0 o 25 x 51 O O 59 EDWARD A. A/AA/CE INVENTOR.

AT TOEA/Ev July 5, 1966 E. A. HANCE 3,259,084

REFUSE INCINERATOR INSERT FOR CONTAINERS Filed July 29, 1963 5 Sheets-Sheet 5 fan 42 ,4 A/AA/C'E INVEN TOR.

ATTORNEY United States Patent 3,259,084v REFUSE INCINERAI R INSERT FO CONTAINERS Edward A. Hance, Willow Road, New Hyde Park, N.Y. Filed July 29, 1963, Ser. No. 298,391 2 Claims. (Cl. 11018) This invention relates to incinerators for combustible refuse, and is particularly directed to an insert, which is fitted to the interior of a hollow container, to facilitate the burning of refuse, or waste material of various types.

It is primarily directed to an insert which is fitted to the interior of a hollow cylindrical drum, or other hollow container, to distribute the refuse placed in the container, and support it in such a manner as to facilitate the passage of air through the refuse and therefore the burning of the refuse.

The primary object of the invention is to provide an insert which may be removably fitted to any type of hollow container, or other type of container, to guide and support the refuse during the burning process,

Another object is to provide a simple, compact insert which may be fitted to any type of hollow container and accurately located relative to the container without special tools or special skills.

Another object is to provide an insert, the various parts of which may be shipped flat, in the form of a kit, and wrapped or otherwise formed to the required shape before assembly, thereby reducing the cost of transportation and storage of the various components of the insert before shipment to the user.

A primary feature of the insert is that it eliminates the dropping of hot ashes, embers, or other partially burned material below the bottom of the drum or container, thereby sharply reducing the fire hazard.

Another feature of the invention is that by introducing paper, wood chips, or other type of readily combustible material into the bottom of the container around the insert, before the refuse is poured into it, the refuse may readily be ignited by means of a match, or a fuse attached to a solid body of highly combustible material, which is dropped into the container after the refuse is placed in it.

Another feature is that the air passing through the insert is controlled and guided in such a manner as to facilitate combustion of the refuse, and that the air in passing through the central body of the insert cools the wire mesh or other material of which the central body is made, thereby prolonging the life of the central body and other parts of the insert} Another feature of the invention is that the refuse or waste material deposited in the container, around the insert, may be ignited by dropping a fuse, which is attached to a solid body of a highly combustible material, after the fuse is ignited. The combustible material igniting the refuse or waste material in the container.

Another feature is that the various elements of the insert, control and guide the air passing through the refuse in the container, thereby facilitating combustion of the refuse, or other waste material in the container.

A major feature of the invention is that the various elements of the insert may be stored and shipped fiat, and sold in kit form, means being provided to enable the user to wrap the body of the insert into a cylindrical form, and the frustorconical cap into its frusto-conical form, means being provided for individually latching the body and the ice frusto-conical cap into their required shape before assembly of the various components of the insert.

Another feature is that the insert may be used with any type of drum or other. hollow container, a plurality of openings being provided at the bottom of the container to assure continuous supply of air to support combustion of the waste material in the container.

Another feature is that the air to support combustion of the waste material, is introduced and guided through the interior of the body of the insert andthe frusto-conical cap, the burned waste material being deposited on the bottom of the drum or other container, no openings being provided, in this area, which surrounds the body of the insert, thereby reducing the possibility of hot ashes or embers from passing below the bottom of the container to the ground and reducing the fire hazard to a minimum.

The accompanying drawings, illustrative of one embodiment of the invention, together with the description of its construction and the method of operation, mounting, assembly and utilization thereof, will serve to clarify further objects and advantages of the invention.

In the drawings:

FIG. 1 is a partial vertical section, and partial front 7 elevational view of the insert fitted to the interior of a drum or other container, showing the various components of the insert in their assembled position.

FIG. 2 is a cross-section through the drum or container, and the body of the insert fitted to the interior of the drum, or other container, showing the bottom plate which supports the body of the insert, the method of locating the body of the insert relative to the bottom plate, and the location of the centering strips, which center the wire mesh body of the insert relative to the interior of the container, the section being taken on the line 2-2, FIG. 1.

FIG. 3 is a cross-section through a portion of the wire mesh body of the insert, shown in FIG. 1, showing the method of latching one end of the'wire mesh body to the other in the assembled position shown in FIGS. 1, and 2, the section being taken on the line 33, FIG. 1.

FIG. 4 is a cross-section, similar to FIG. 3, through another portion of the wire mesh body shown in FIG. 1, showing the unlatched adjoining ends of the body, the section being taken on the line 4 4, FIG. 1.

FIG. 5 is a cross-section through a portion of the frustoconical cap of the insert shown in FIG. 1, showing the method of latching the adjoining ends of the frusto-conical cap, the section being taken on the line 5-5, FIG. 1.

FIG. 6 is a vertical section through a portion of the bottom plate, shown in FIG. 2, showing the method of forming one of the legs supporting the bottom plate, the section being taken on the line 6-- 6, FIG. 2.

FIG. 7 is a vertical section through another portion of the bottom plate shown in FIG. 2, showing one of the slitted areas which provide a plurality of flanges, which center, locate and guide the wire mesh body relative to the bottom plate, the section being taken on the line 7-7, FIG. 2.

FIG. 8 is a flat development of the wire mesh body shown in FIG. 1, showing the extensions of portions of the body, which latch the two ends of the Wire mesh body to one another in the manner shown in FIG. 3.

FIG. 9 is a plan view of the flat developed blank of the frusto conieal feap of the insert shown in FIG. 1, showing the projections integral with one edge of the blank, which latch the two ends of the cap blank to one another in the assembled position, in the manner shown in FIG. 5.

FIG. is a plan view of a portion of the bottom plate, shown in FIG. 7, showing the method of forming one of the flanges, which locate the inner surface of the body of the insert.

It will be understood that the following description of the construction and the method of mounting and operation of the refuse incinerator insert for containers is intended as explanatory of the invention and not restrictive thereof.

In the drawings, the same reference numerals designate the same parts throughout the various views, except where otherwise indicated.

One embodiment of the incinerator construction shown in FIGS. 1 and 2 is fitted to the interior of a cylindrical drum 10, or other container having a bottom wall 11 attached thereto.

The insert is supported and located by a substantially circular bottom plate 12, which is substantially centered relative to the bottom wall of the drum, in a manner hereinafter described, the bottom plate being supported and spacedly located relative to the bottom wall of the drum, by a plurality of radially positioned legs 14 and 15, which are integral with, and substantially perpendicular to the bottom plate of the insert.

A tubular central body 17 formed of wire mesh, or other perforated material, is located above the bottom plate, the wire mesh body being centered and aligned with the bottom plate by a plurality of radially positioned flanges 18, 19, shown in FIG. 2, which are integral with and substantially perpendicular to the bottom plate.

A hollow substantially frusto-conical cap 20, is located above the top of the body and supported thereby, the cap being formed of a thin sheet steel or other material, in a manner hereinafter described. The lower portion of the cap extends below and around the top of the body, to shield the body from the waste materials.

A flat substantially circular top plate 22 is located above the top of the cap 20, the top plate having a central opening therethrough, which receives a clamping bolt 23, which clamps the top plate 22 to the bottom plate 12 and therefore clamps the various components of the insert to one another in a manner hereinafter described.

In order to center or otherwise locate the bottom plate 12 relative to the interior of the drum, or other container, a pair of centering strips 25, 26, shown in FIGS. 1 and 2, is located below the bottom plate 12, between the bottom plate 12 and the bottom wall of the drum, the centering strips being substantially perpendicular to, or otherwise angularly positioned relative to one another, each of the centering strips having a central opening 27 therethrough, to receive the body of the clamping bolt, shown in FIG. 1. Each of the centering strips is formed of relatively soft strip steel or a similar material, which enables the ends thereof to be bent over to form a pair of flanges, in a manner hereinafter described.

Each of the centering strips has a pair of end flanges 28, 29, integraltherewith, the flanges, which are bent over to a position substantially perpendicular to the centering strip proper, before inserting the centering strips 25, 26 into the drum, being located adjacent the inner surfaces of the cylindrical outer wall 30 of the drum or other container, to accurately center the centering strips, and therefore the bolt supported thereby, and in that manner centering the bottom plate of the insert, which is centrally located by the clamping bolt 23.

The clamping bolt 23 shown in FIG. 1, includes a body section 31, which extends from the bottom of the centering strips 25, 26, to a point above the top of the plate 22, the bottom of the body of the bolt having a short ledge 32, which is substantially perpendicular to the body of the bolt and integral therewith, the ledge engaging the lower edge of one of the centering strips to vertically locate the body of the bolt relative to the Centering strips 25', 26.

The body of the bolt extends through a central opening through the bottom plate 12, through the body of the insert, thence through the cap 20 and through a central opening through the top plate 22, a threaded section 34 being integral with the upper end of the body of the bolt, to receive a wing nut 35, or other type of nut, which is threadably fitted to the threaded section, the wing nut being operative to clamp the top plate 22 to the bottom plate 12 and the centering strips supporting the bottom plate, thereby clamping the frusto-conical cap and the body of the insert to the bottom plate, and the center ing strips supporting the bottom plate, and in that manner clamping the various elements of the insert to one another, and retaining them in their central position, or other desired position relative to the drum.

FIGS. 2 and 6 show the method of forming the legs 14 and 15, which support the bottom plate 12, relative to the bottom wall 11 of the drum. A plurality of pairs of the substantially parallel radially positioned slits 38, 39, is cut through the outer circumference of the bottom plate 12, the material between each pair of slits 38, 39 being folded over to form one of the legs 14, 15, as shown in FIG. 6.

The radially positioned locating flanges 18, 19, shown in FIGS. 2 and 7, are each formed by cutting a pair of substantially parallel slits 40, 40a, and an end slit 41 substantially perpendicular to the parallel slits, 40 40a through the bottom plate 12 at one of the radially positioned locations shown in FIG. 2.

After slitting, the material between the parallel slits 40, 40a and the end slit 41 is bent up to a position substantially perpendicular to the bottom plate 12, to form one of the flanges 18, 19, which engage the inner surface of the body of the insert, to accurately center the body of the insert, relative to the bottom plate 12 thereof.

The bottom plate also has a plurality of rows of radially positoned openings 43, 44 therethrough, to allow ashes, or other material which falls through the wire mesh of the body from the waste material, which is burned around the body of the insert in a manner hereinafter described, to fall therethrough to the bottom wall 11 of the drum, the ashes falling through a plurality of openings 45, 46 through the bottom wall of the drum to the ground.

In order to provide a continuous supply of air for combustion of the waste material in a manner hereinafter described, the drum is elevated relative to the ground by a plurality of blocks 47, 48, or other suitable support means, which is located below the bottom surface of the drum, the blocks elevating the drum relative to the ground.

When the body of the insert is formed of wire mesh of rectangular cross-section, as shown in FIGS. 1 and 8, the body is supplied in the form of a flat blank, such as that shown in FIG. 8, the blank body consisting of a plurality of rows of substantially parallel horizontal sections 49, 50, of circular wire or other suitable material, which form the inner rings of the body shown in FIG. 2, and a plurality of spaced substantially parallel vertical sections 51, 52, which form the vertical bars of the body shown in FIG. 1, the insert sections between the horizontal and vertical sections being soldered or otherwise attached to one another to form an integral sheet which may be wrapped around in the manner shown in FIG. 2, to form a substantially cylindrical body.

Some of the horizontal sections of the wire mesh body have an extension 53 integral therewith and projecting beyond one end thereof, the extension being bent around the adjacent vertical section 52, at the opposite edge of the body blank, to form a series of latches, such as those shown in FIG. 3, to retain the body in the circular form shown in FIGS. 1 and 2.

In the areas between the latching sections of the body, adjoining vertical end sections of the body abut one another, or are separated from one another by a relatively short gap in the manner shown in FIG. 4.

In order to guide the horizontal sections of the body when the body is wrapped into the circular form shown in FIG. 2, a relatively short auxiliary extension 54 is integral with each of the horizontal sections of the body, the auxiliary extensions being located opposite the extensions 5-3, the auxiliary extensions projecting beyond the adjacent end vertical section of the body to locate the adjacent vertical end sections relative to one another when the body is wrapped in the circular form shown in FIGS. 2 and 4.

The frusto-conical cap shown in FIG. 1, is also supplied in the form of a flat blank 56 in the form of a sector of .an annular ring, as shown in FIG. 9.

One edge of the blank has a plurality of tabs 57, 57a integral therewith and projecting outward therefrom, the opposite edge of the blank having a plurality of narrow slots 58, 58a, of modified rectangular form out therethrough, each of the slots being operative to receive one of the tabs 57, 57a, when the cap is wrapped around into the frusto-conical form shown in FIG. 1, the tabs being folded around the outer surface of the cap to form the latches shown in FIG. 5.

As shown in FIGS. 1 and 2, each of the centering strips 25, 26 may be formed of a long strip of thin sheet steel, or other suitable material, or one edge 59 thereof may be folded over to form a reinforcing strip, the reinforcing strip being integral with the centering strip, as shown in FIGS. 1 and 2.

The operation of the incinerator is substantially as follows:

After the incinerator insert is located in the drum, in the position shown in FIGS. 1 and 2, a small quantity of paper, wood chips or other relatively highly combustible material is deposited in the bottom of the annular aret. between the outer wall of the drum and the outer surface of the body of the insert shown in FIG. 1.

After this, combustible waste material, including all types of refuse is deposited into the interior of the drum, or other container, the waste material being deposited over the upper edge of the frusto-conical cap, and distributed by the frusto-conical cap, the lower portion of which projects beyond the outer surface of the body of the insert into the annular area between the body of the insert and the inner surface of the drum.

The waste material in the drum, or other container may be ignited by a simple fuse, which is attached to a solid body of highly combustible material, the combination of the fuse and the combustible material being dropped into the waste material to ignite it.

In place of the fuse, a match or other flame producing object may be dropped into the waste material, additional paper, twigs, or wood chips being deposited into the waste material to facilitate ignition thereof.

After the waste material is ignited, the draft of air flowing through the openings 45, 46 through the bottom wall of the drum, thence through the bottom plate 12, passes through the wire mesh body of the insert, the stream of air engaging the sloping inner surface of the frusto-conical cap 20 located above the top of the body, and being deflected thereby through the wire mesh openings located near the top of the body, which directs the stream of air through the waste material surrounding the drum, thereby facilitating and supporting combustion of the waste material surrounding the body of the insert.

A portion of the stream of air also passes through the wire mesh areas in other parts of the body of the insert, thus facilitating and supporting combustion of the waste material surrounding the body of the insert.

After the waste material in the interior of the drum is ignited, it continues to burn until all of the material in the drum has been burned.

In place of the drum hereinbefore specified, the insert may be located in the interior of a hollow concrete container, or other type of container, the flange at the ends of the centering strips being bent upward to suit the inner diameter of the patricular container used.

The openings 45, 46 in the bottom wall of the drum and the openings 43, 44 in the bottom plate of the insert, which are in communication therewith create a suction, which forces air through the body of the insert and out through the waste material surrounding the body of the insert, thereby supporting combustion of the waste material surrounding the body of the insert.

The openings in the bottom plate, which are located in the interior of the body of the insert, allow air to pass. through the body of the insert, the stream of air being deflected by the inner surface of the frusto-conical cap, and guided to the waste material surrounding the body of the insert, thereby supporting combustion of the waste material.

No holes are located in the bottom wall of the drum, in the area surrounding the outer circumference of the body of the insert. This prevents waste material, which is burned in the area surrounding the body of the insert from falling through the bottom wall of the drum.

This reduces the fire hazard to a minimum, as no burned material can fall through the bottom of the drum from the combustion area, surrounding the body of the drum, to the ground.

The updraft of air through the center of the body of the insert and therefore through the waste material surrounding the body of the insert, supports and facilitates combustion of the waste material surrounding the body of the insert.

The residue of the burned material in the bottom of the drum is deposited on the bottom wall of the drum, around the outer circumference of the body of the insert in the form of fly ash or other ashes.

This deposit does not affect combustion of Waste material later deposited in the drum, as the air supporting combustion of the waste material passes through openings in the bottom wall of the drum and in. the bottom plate, which are located below the body of the insert, and therefore away from the waste material, which is deposited around the outer surface of the body of the insert.

The insert may be sold, stored and shipped in the form of a kit, thus reducing storage space and shipping costs to a minimum.

The body of the insert is supplied as a flat blank or development in the manner shown in FIG. 8.

The frusto-conical cap is also supplied as a flat blank, or development in substantially the manner shown in FIG. 9.

The bottom plate is supplied substantially flat, only the legs 14, 15 projecting below the bottom surface of the bottom plate, and the relatively short flanges 18, 19, projecting beyond the upper surface of the bottom plate.

The small top plate located above the cap is relatively small and flat.

The centering strips 25, 26 are also supplied flat, the flanges 28, 29 at both ends of each centering strip being formed before the individual centering strip is inserted in the interior of the drum.

The clamping bolt 23 is also relatively long and flat, the ledge projecting from one end of the bolt being relatively short, and occupying very little space.

Thus the entire insert may be shipped flat in a carton and assembled by the user by means of relatively simple tools, which are readily available, such as pliers, a hammer and the like, very little skill being required to convert the flat blanks to the finished form shown in FIGS. 1 and 2.

The flanges 18, 19, shown in FIGS. 2 and 7, which center and locate the body of the insert relative to the bottom plate may be of rectangular contour as shown in FIGS. 7 and 8, or the slits through the bottom plate forming the flanges may be of circular segmental or other suitable form, the contour of the flange being controlled by the contour of the individual slits.

The fuse with the highly combustible solid body attached thereto, may be dropped into the waste material 7 after the combustible material is ignited, by a match or other suitable ignition means, the highly combustible body igniting the combustible waste material into which it is dropped.

Due to the location of the openings in the bottom of the drum, which are located away from the waste material, and therefore the combustion area, no hot embers can flow through the bottom of the drum to the ground, thus reducing the fire hazard to a minimum and allowing the insert to comply with regulations controlling the use and location of outdoor incinerators.

Only fly ash, or similar ash, which is completely burned and therefore relatively safe, will drop through the central openings through the bottom wall of the drum.

Instead of using the insert with a drum, or other similar container, it can be deposited in a well casing, or other similar container.

The stream of air passing through the interior of the body of the insert, and through the openings through the bottom plate, tends to cool the wire mesh of which the body of the insert is formed, thereby reducing deterioration of the wire mesh of the body to a minimum, and prolonging the life of the wire mesh body, which is the only relatively delicate component of the entire insert.

By having the stream of air flow through the central openings through the bottom plate, thence through the interior of the wire mesh body, and guiding the air stream by means of the inner surface of the frusto-conical cap, the supply of air to the waste material surrounding the body of the insert is controlled, to facilitate combustion of the waste material.

The openings through the bottom plate are radially positioned and follow a circular, or other suitable pattern. The diameter and number of openings through the bottom plate would be controlled by the volume of air required to support combustion, and the size of the ash particles which would flow through the openings from the interior of the body of the insert.

It will be apparent to those skilled in the art that the present invention is not limited to the specific details described above and shown in the drawings, and that various modifications are possible in carrying out the features of the invention and the operation, assembly, and the method of utilization thereof, without departing from the spirit and scope of the appended claims.

What is claimed is:

I. 'A waste material incinerator insert in combination with a hollow container having a bottom wall and an outer wall, substantially perpendicular to the bottom wall, the bottom wall of the container being spacedly located relative to the ground on which the container is mounted, comprising a bottom plate spacedly located relative to and substantially parallel to the bottom wall of the container, means located adjacent the bottom plate operative to radially locate the bottom plate relative to the outer wall of the container, a tubular body formed of a perforated material supported by the bottom plate, said bottom plate having means formed thereon, operative to radially locate the body relative to the bottom plate, a cap formed of a thin sheet material fitted to one end of the body, said cap being of substantially frusto-conical contour, said cap having an opening through the free end thereof, a top plate located adjacent the free end of the cap, said top plate covering the opening through the cap, and a clamping bolt inserted through the bottom plate and the top plate, said clamping bolt extending through the body and the cap, said clamping bolt having means integral therewith operative to engage one face of the container outer wall locating means, and means threadable fitted to the portion of the clamping bolt extending through the top plate, operative to engage the top plate, thereby to clamp the top plate to the bottom plate and the container outer wall locating means, the body being of substantially circular cross-sectional contour, the lower portion of the frusto-conical cap extending beyond the circumferential outer wall of the body to shield the body, the bottom plate having a plurality of openings therethrough located within the area of the bottom plate surrounded by the interior of the body, the bottom wall of the container having a plurality of openings therethrough located in the general area in which the openings through the bottom plate are located, means elevating the container to spacedly locate the bottom wall thereof relative to the ground on which the container is mounted, combustible waste material being deposited in the area between the circumferential outer Wall of the body of the insert and the inner surface of the container outer wall, the openings through the bottom wall of the container and the bottom plate allowing a stream of air to pass therethrough, the air passing through the inner area of the body of the insert toward the inner surface of the cap, the projecting frusto-conical inner surface of the cap directing the stream of air toward the waste material to facilitate combustion of the waste material.

2. A waste material incinerator insert in combination with a hollow container having a bottom wall and an outer wall, substantially perpendicular to the bottom wall, the bottom wall of the container being spacedly located relative to the ground on which the container is mounted, comprising a bottom plate spacedly located relative to and substantially parallel to the bottom wall of the container, means located adjacent the bottom plate operative to radially locate the bottom plate relative to the outer wall of the container, a tubular body formed of a perforated material supported by the bottom plate, said bottom plate having means formed thereon, operative to radially locate the body relative to the bottom plate, a cap formed of a thin sheet material fitted to one end of the body, said cap being of substantially frusto-conical contour, said cap having an opening through the free end thereof, a top plate located adjacent the free end of the cap, said top plate covering the opening through the cap, and a clamping bolt inserted through the bottom plate and the top plate, said clamping bolt extending through the body and the cap, said clamping bolt having means integral therewith operative to engage one face of the container outer Wall locating means, and means threadable fitted to the portion of the clamping bolt extending through the top plate, operative to engage the top plate, thereby to clamp the top plate to the bottom plate and the container outer wall locating means, the body of the insert being of substantially circular cross-sectional contour, the lower portion of the frusto-conical cap extending beyond the circumferential outer surface of the body to shield the body, the bottom plate having a plurality of radially positioned legs integral therewith to elevate the bottom plate relative to the bottom wall of the container, the bottom plate having a plurality of openings therethrough located within the area of the bottom plate surrounded by the body, the bottom wall of the container having a plurality of openings therethrough located in the area of the bottom wall subtended by the bottom plate, means elevating the container to spacedly locate the bottom wall of the container relative to the ground on which the container is mounted, combustible waste material being located in the area between the circumferential outer wall of the body and the inner surface of the outer wall of the container, the combustible Waste material being located in said area by depositing it above the frustoconical outer surface of the cap, the cap directing the Waste material toward the area surrounding the body of the insert, the openings through the bottom wall of the container and the bottom plate allowing a stream of air to pass therethrough, the stream of air passing through the interior of the body, toward the inner surface of the cap, the projecting frusto-conical inner surface of the cap directing the stream of air toward the waste material surrounding the body to facilitate combustion of the waste material.

(References on following page) References Cited by the Examiner UNITED STATES PATENTS Foster.

Woolston 127-77 Bonnet 126-163 Bear.

Fox 110-18 Revel].

Dutton 126-163 Kaufman Suciu 110-18 Higman 126-65 X Knipe et a1 110-18 X ONeil 126-77 X Hinderer 126-9 Sams 110-7 X Wynkoop 110-1 FREDERICK L. MATTESON, 18., Primary Examiner.

110 18 X 10 H. B. RAMEY, Assistant Examiner. 

1. A WASTE MATERIAL INCINERATOR INSERT IN COMBINATION WITH A HOLLOW CONTAINER HAVING A BOTTOM WALL AND AN OUTER WALL, SUBSTANTIALLY PERPENDICULAR TO THE BOTTOM WALL, THE BOTTOM WALL OF THE CONTAINER BEING SPACEDLY LOCATED RELATIVE TO THE GROUND ON WHICH THE CONTAINER IS MOUNTED, COMPRISING A BOTTOM PLATE SPACEDLY LOCATED RELATIVE TO AND SUBSTANTIALLY PARALLEL TO THE BOTTOM WALL OF THE CONTAINER, MEANS LOCATED ADJACENT THE BOTTOM PLATE OPERATIVE TO RADIALLY LOCATE THE BOTTOM PLATE RELATIVE TO THE OUTER WALL OF THE CONTAINER, A TUBULAR BODY FORMED OF A PERFORATED MATERIAL SUPPORTED BY THE BOTTOM PLATE, SAID BOTTOM PLATE HAVING MEANS FORMED THEREON, OPERATIVE TO RADIALLY LOCATE THE BODY RELATIVE TO THE BOTTOM PLATE, A CAP FORMED OF A THIN SHEET MATERIAL FITTED TO ONE END OF THE BODY, SAID CAP BEING OF SUBSTANTIALLY FRUSTO-CONICAL CONTOUR, SAID CAP HAVING AN OPENING THROUGH THE FREE END THEREOF, A TOP PLATE LOCATED ADJACENT THE FREE END OF THE CAP, SAID TOP PLATE COVERING THE OPENING THROUGH THE CAP, AND A CLAMPING BOLT INSERTED THROUGH THE BOTTOM PLATE AND THE TOP PLATE, SAID CLAMPING BOLT EXTENDING THROUGH THE BODY AND THE CAP, SAID CLAMPING BOLT HAVING MEANS INTEGRAL THEREWITH OPERATIVE TO ENGAGE ONE FACE OF THE CONTAINER OUTER WALL LOCATING MEANS, AND MEANS THREADABLE FITTED TO THE PORTION OF THE CLAMPING BOLT EXTENDING THROUGH THE TOP PLATE, OPERATIVE TO ENGAGE THE TOP PLATE, THEREBY TO CLAMP THE TOP PLATE TO THE BOTTOM PLATE AND THE CONTAINER OUTER WALL LOCATING MEANS, THE BODY BEING OF SUBSTANTIALLY CIRCULAR CROSS-SECTIONAL CONTOUR, THE LOWER PORTION OF THE FRUSTO-CONICAL CAP EXTENDING BEYOND THE 